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MPas Hydraulic-set Packer

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The MPas™ formation packer is a primary cementing and zone isolation packer utilizing a non-inflatable packing element run as an integral part of the casing or liner string to provide a permanent seal between the casing and wellbore.

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Rotationally locking pins on either side of the element prevents element damage while running in a hole. The MPas contains an elastomeric element with a composite structure set mechanically by applying a hydraulic pressure differential from the packer's inside diameter (ID) to the outside diameter (OD). When the differential pressure is high enough, the lower piston shears and moves down, releasing the piston as hydraulic differential pressure and hydrostatic pressure acting against an atmospheric chamber. The force acting on the setting piston mechanically sets the element. The setting force is locked into the element by a body lock ring so that the element Remains set after the hydraulic force is released. The hydrostatic setting force continues to act on the element so that it will continue to conform to the wellbore even if its geometry changes over the packer's life. This design allows additional hydraulic setting force to be applied to the packer at any time during its life.

Features and Benefits

The MPas packer can be used as a cementing packer or for zone isolation in completions having no cement. The MPas packer performs the following functions:

  • Provides zone isolation - Seals well bore between zones either as backup for cement or as the primary seal.
  • Permanent isolation - Provides permanent zonal isolation without the complexity and expense of pumping cement to inflate a packer element.
  • Protects cement - Channeling damage is prevented by blocking movement of gas or fluid so that the cement is allowed to set undisturbed.
  • Compensates for wellbore movement - The MPas packer compensates for wellbore movement around the seal area due to hydrostatic pressure providing a continuous setting force on the element eliminating the need for intervention.
  • Setting force locked into the element - A body lock ring ensures that the element stores the setting force.
  • Protection against premature element setting - Locking dogs protect against premature element setting until a hydraulic pressure sufficient to shear the shear screws in the setting piston is applied to the MPas packer ID.
  • Progressive setting of MPas element - A progressive setting sleeve inside the element allows for a progressive set of the element to fully set and conform to the wellbore.
  • Protect sensitive formations - Sensitive formations are isolated from cement and protected from damage.
  • Allows cementing deep wells without damaging lower zones - Deep wells can be stage cemented to protect the lower zones from the high differential pressure of a long column of cement.
  • Provides proper cement distribution - The MPas packer helps to centralize the casing in the hole to ensure even cement distribution around casing.
  • Torque mechanism - Prevents element damage from drag during pipe rotation.
  • Circulation rate - Allows 20 ft/sec as a maximum annular velocity rate between openhole ID and inflatable element OD.
  • Applications
    • Zonal Isolation
    • Cementing operations
    • Popular resources